Inspect the center bearing.

Is the bearing worn?

--

Go to Step 2

Go to Step 3

Replace the center bearing. Center Bearing Replacement .

Is roughness or vibration still evident?

--

Go to Step 3

System OK

Inspect the hanger.

Is the hanger worn?

--

Go to Step 4

Go to Step 5

Replace the hanger.

Is roughness or vibration still evident?

--

Go to Step 5

System OK

Inspect the universal joints.

Do the universal joints require lubrication?

--

Go to Step 6

Go to Step 7

Lubricate the universal joints. Refer to Fluid and Lubricant Recommendations in Maintenance and Lubrication.

Is roughness or vibration still evident?

--

Go to Step 7

System OK

Inspect the universal joints.

Are the universal joints worn?

--

Go to Step 8

Go to Step 9

Replace the universal joints. Refer to Universal Joint Replacement .

Is roughness or vibration still evident?

--

Go to Step 9

System OK

Inspect the flange bolts.

Are the bolts loose?

--

Go to Step 10

Go to Step 11

Tighten the flange bolts to specification. Refer to Fastener Tightening Specifications .

Is roughness or vibration still evident?

--

Go to Step 11

System OK

Inspect the tires. Refer to Tire and Wheel Inspection in Vibration Diagnosis and Correction.

Are the tires worn or out of balance?

--

Go to Step 12

Go to Step 13

Balance or replace the tires as necessary. Refer to Tire and Wheel Balancing in Vibration Diagnosis and Correction or Tire Mounting and Dismounting in Wheels and Tires.

Is roughness or vibration still evident?

--

Go to Step 13

System OK

Inspect the companion flange.

Are there burrs or gouges on the companion flange?

--

Go to Step 14

Go to Step 15

1. Inspect the snap ring locating surfaces on the flange yoke.
2. Rework or replace the companion flange.

Is roughness or vibration still evident?

--

Go to Step 15

System OK

Inspect the propeller shaft. Refer to Diagnosing First-Order Driveline Vibration in Vibration Diagnosis and Correction.

Is the propeller shaft unbalanced?

--

Go to Step 16

Go to Step 17

1. Inspect the propeller shaft for a missing balance weight.
2. Remove the propeller shaft.
3. Install the propeller shaft to the companion flange 180° from the original position.

Is roughness or vibration still evident?

--

Go to Step 17

System OK

Inspect the parking brake drum. Refer to Brake Drum Inspection in Park Brake.

Is the parking brake drum worn?

--

Go to Step 18

Go to Step 19

Replace the parking brake drum. Refer to Brake Drum Replacement in Park Brake.

Is roughness or vibration still evident?

--

Go to Step 19

System OK

Inspect the rear joint angle. Refer to Diagnosing Second-Order Driveline Vibration in Vibration Diagnosis and Correction.

Is the angle too large or too small?

--

Go to Step 20

Go to Step 21

Correct the rear joint angle.

Is roughness or vibration still evident?

--

Go to Step 21

System OK

Inspect the slip yoke spline.

Is the slip yoke spline excessively loose?

--

Go to Step 22

Go to Step 23

Replace the parts as necessary.

Is roughness or vibration still evident?

--

Go to Step 23

System OK

Inspect the yokes.

Are the yokes distorted or damaged?

--

Go to Step 24

Go to Step 25

Install the new yokes.

Is roughness or vibration still evident?

--

Go to Step 25

System OK

Inspect for propeller shaft phasing. Refer to Diagnosing Second-Order Driveline Vibration in Vibration Diagnosis and Correction.

Are the yokes out of parallel to each other?

--

Go to Step 26

Go to Step 27

Correct the propeller shaft phasing.

Is roughness or vibration still evident?

--

Go to Step 27

System OK

Inspect the propeller shaft.

Is there dirt or debris on the propeller shaft?

--

Go to Step 28

Go to Step 29

Clean the propeller shaft.

Is roughness or vibration still evident?

--

Go to Step 29

System OK

Inspect the propeller shaft.

Is the propeller shaft bent or dented?

--

Go to Step 30

--

Replace the propeller shaft. Refer to the following procedures:

Is roughness or vibration still evident?

--

--

System OK

DEFINITION: One hears or feels a roughness when driving the vehicle above 56 km/h (35 mph).

The tires are unbalanced or worn.

Balance or replace the tires. Refer to Tire and Wheel Balancing in Vibration Diagnosis and Connection or Tire Mounting and Dismounting in Tire and Wheels.